Jordi Espasa Clofent:
> Hi all,
>
> I've a Postfix working with Perl-based filter. All works fine, but I
> don't want filter the legitimate users (who are authenticated using
> SASL) when they want to do massive mailing using their e-mail client
> (ThunderBird, Outlook... and so on).

That is easy.

Have your users connect to the submission port, and let everyone
else connnect to the smtp port. Then, specify "=o content_filter=whatever"
for the smtp port and not for the submission port.

If you are taking in all mail on port 25 then you are making mail
handling more complicated than it needs to be.